Introduction

The term "MAHDI" is a title meaning "The Guided one". Mahdi is a normal man who is going to follow the true Islam. His name will be Muhammad and his father name will be 'Abdullah. He is a descendant from Ali and Fatima (daughter of the prophet Muhammad (pbuh)) so he will be descendant from al-Hasan or al-Husain. Mahdi will be very just and his capital will be Damascus.
Allah told us that Jews will master the world two times (we live now 1998 during the first one) and Mahdi will appear between those two periods and will rule through the last one.
Mahdi is NOT a prophet but he is the final Rightly Guided Khalifa.
Mahdi will lead Muslims to a great victory against the Christian Romans (i.e. All the white Europeans including the Americans). This Great War is called al-Malhamah al-Kubrah or Armageddon. It will end up with a great victory to Muslims against Romans after six years. Muslims will take over their capital Rome (this can be any city). In the seventh year, the Antichrist will appear and a greater war will start between Jews and Muslims for 40 days (longer that usual days) and will end when Jesus (pbuh) will come and Muslims will kill all Jews. All people will convert into Islam. Peace will pervade the whole world.
As Muslims, we should remember that the prophecy about Mahdi is one that will come to pass. This prophecy, however, does not absolve the Muslim Ummah from its duty to strive in the cause of Allah, oppose injustice, and seek peace and betterment of human condition. Centuries have passes from the time of the holy Prophet and there is a good possibility that many more will expire before the advent of the Mahdi. Muslims who are negligent in their duty hoping for a savior are committing a grave mistake and are not following the divine decrees ordained in Quran or taught by the Prophet Muhammad (pbuh).